[AmericaUnite]

Coumarin blood thinning rat poison?

Too soon after ingesting.

[GSlob]

"Too soon after ingesting."
Their falling ill en masse only indicates that they consumed it en masse, too. Nowhere is it following from that they had to consume it at the meal immediately preceding the symptoms - given the ramadan fast and the evening meals during it, they could have been fed the stuff the evening before.